Send email.
Bring your own provider.
Transactional email through your own SMTP provider — Resend, SES, Postmark, Mailgun or your own Postfix. koigrid relays through your account, so there are no per-domain limits, no shared reputation, and no extra cost. Send by API or your AI agent.
Reselling email is where deliverability goes to die
Platforms that resell email put you on a shared IP with everyone else — one bad sender and your receipts land in spam — and cap you to one domain on the free tier. Amazon SES is cheap but means DKIM records, a sandbox, bounce handling and IAM before your first email. koigrid takes the model Vercel and Railway use: you bring your own SMTP, we relay through it. Your account, your reputation, your domains — no limits, no markup.
How koigrid compares
| koigrid (BYO SMTP) | Resold email | AWS SES direct | |
|---|---|---|---|
| Sending reputation | Yours (your account) | Shared with everyone | Yours |
| Domain limit | None (your provider’s) | Often 1 on free tier | None |
| Cost on top | Zero (you pay your provider) | Marked up | SES pricing |
| Setup | Paste your SMTP string | Verify on their platform | DKIM + sandbox + IAM |
| Provider lock-in | None — swap any time | High | AWS |
| Send by API or AI agent | Native | Varies | API (complex) |
BYO = bring your own SMTP. koigrid stores your credentials encrypted, verifies them on save, and relays your messages — with per-plan rate limits and a delivery ledger.
Yours, encrypted, metered
Bring any SMTP
Resend, SES, Postmark, Mailgun, Gmail or your own server — if it speaks SMTP, koigrid relays through it.
Encrypted at rest
Your SMTP credentials are stored AES-256-GCM encrypted, per organization, and verified the moment you save them.
Rate limits + ledger
A per-plan daily send limit and a full delivery ledger — every message, its status and provider id.
No reputation risk for you
You send from your own account and IP — koigrid never mixes your mail with anyone else’s.
Agent-native
Configure the provider and send messages from Claude Code or any LLM via the API.
Zero lock-in
Swap providers by pasting a new SMTP string — nothing else changes.